What is the greatest common factor of 18 and 24?

What is the greatest common factor of 20 and 30?

What is the greatest common factor of 16 and 40?

What is the greatest common factor of 27 and 36?

What is the greatest common factor of 24 and 60?

What is the greatest common factor of 45 and 60?

What is the greatest common factor of 16 and 20?

What is the greatest common factor of 32 and 48?

What is the greatest common factor of 42 and 56?

What is the greatest common factor of 7 and 21?

What is the least common multiple of 8 and 12?

What is the least common multiple of 4 and 10?

What is the least common multiple of 9 and 12?

What is the least common multiple of 6 and 12?

What is the least common multiple of 5 and 9?

What is the least common multiple of 2 and 5?

What is the least common multiple of 3 and 10?

What is the least common multiple of 2 and 9?

What is the least common multiple of 3 and 4?

What is the least common multiple of 5 and 7?

What is the least common multiple of 4 and 9?

Mr. Reed has 24 pencils and 36 erasers. He fills identical gift bags using every item with none left over. What is the largest number of bags he can fill?

A teacher has 18 red balloons and 30 blue balloons. She makes identical bunches using all of them. What is the largest number of identical bunches she can make?

A grocer packs 40 apples and 32 oranges into identical baskets with none left over. What is the largest number of baskets he can pack?

A coach splits 45 boys and 30 girls into equal teams, each team getting the same number of boys and of girls. What is the greatest number of teams he can form?

Nina has 28 stickers and 42 cards. She makes identical craft kits using all of them. What is the largest number of identical craft kits she can make?

A shop packs 50 stickers and 75 stamps into identical bundles with nothing left over. What is the largest number of bundles the shop can pack?

An art teacher shares 54 crayons and 36 markers among groups, giving every group the same amount of each. What is the largest number of groups she can share them among?

A baker packs 21 muffins and 35 cookies into identical boxes with none left over. What is the largest number of boxes she can pack?

Two ribbons are 48 centimeters and 72 centimeters long. Both are cut into equal pieces with no waste. What is the longest possible length of each piece?

A librarian shelves 33 poetry books and 44 story books, putting the same number of each kind on every shelf. What is the largest number of shelves he can fill?

One bus leaves every 3 minutes and another leaves every 5 minutes. They just left together. In how many minutes will they next leave together?

A red light blinks every 4 seconds and a green light every 6 seconds. They just blinked together. In how many seconds will they next blink together?

Ben goes to the gym every 6 days and swims every 8 days. He did both today. In how many days will he next do both on the same day?

Hot dogs come in packs of 10 and buns in packs of 8. What is the smallest number of hot dogs that matches an exact number of buns?

One alarm rings every 3 minutes and another rings every 8 minutes. They just rang together. In how many minutes will they next ring together?

A Ferris wheel turns every 2 seconds and a carousel every 7 seconds. They just finished together. In how many seconds will they next finish together?

Two runners start together. One laps every 6 minutes and the other every 9 minutes. In how many minutes will they next cross the start line together?

One comet returns every 3 years and another returns every 11 years. Both appeared this year. In how many years will they next appear together?

A clock tower chimes every 4 minutes and a bell rings every 5 minutes. They just sounded together. In how many minutes will they next sound together?

One machine seals a box every 6 seconds and another every 10 seconds. They just sealed together. In how many seconds will they next seal a box together?